Famoco PX400 Replacement Battery 7.4V 2600mAh Li-ion

Famoco PX400 — 7.4V Li-ion Replacement Battery

This is a 7.4V, 2600mAh Li-ion battery for the Famoco PX400 portable payment terminal. It fits the PX400 directly and restores full terminal function when the original cell degrades. Capacity figures come from the product specification — 19.24Wh total.

• PX400 platform fit: The PX400 runs a 7.4V battery rail shared across its display, wireless radio, and integrated receipt printer. This cell matches that voltage and connector configuration. Swapping a mismatched voltage causes the BMS to reject the pack at handshake.
• Bench tested on actual hardware: We cycled this cell through PX400 boot sequences and simulated transaction loads, including printer motor draws. The BMS held its overcurrent threshold without nuisance trips and passed charge handshake on each cold-start.
• First deployment tip: After installing this battery, run one complete transaction cycle — including a receipt print — before putting the terminal into live service. The PX400 maps battery capacity during normal operation and needs at least one full power cycle to calibrate the charge indicator accurately.

Terminal not completing PCI boot sequence after battery swap

The PX400 runs a PCI-compliant security check at every cold boot. A freshly installed battery may not yet have passed the BMS handshake fully, causing the terminal to stall or loop before reaching the home screen. This is not a defective cell — it is the BMS initialising its communication with the terminal's charge IC. Connect the terminal to its charger, let it reach a full charge state, then perform a clean power cycle. After that sequence, the boot process completes normally.

Terminal reboots mid-transaction during receipt printing

The receipt printer motor pulls a sharp current spike — often 1.5–2A for a fraction of a second — on top of the display and wireless draw already running. If the cell voltage sags below the BMS undervoltage threshold during that spike, the BMS trips and the terminal resets. This typically happens when a battery has aged past roughly 70% of its original capacity or when a new cell is very cold. A cell at room temperature and above 3.6V per cell (7.2V pack voltage) handles the combined load without tripping. If reboots persist after the cell warms and charges fully, check that the connector seating is firm — a loose contact increases effective resistance and worsens voltage sag.